CSS Issues with @keyframes

I want to get this code to run, but I cannot figure out to get the keyframes working. Check out this video. 07.05.2025_10.35.44_REC

.animated-gradient-bg {

background: linear-gradient(-45deg, #ADD8E6, #6699CC, #0033A0, #483D8B, #0033A0, #6699CC, #ADD8E6);

background-size: 400% 400%;

animation: gradientFlow 15s ease infinite;

}

@keyframes gradientFlow {

0% { background-position: 0% 50%; }

50% { background-position: 100% 50%; }

100% { background-position: 0% 50%; }

}